Back rest for cylindrical grinders



Dec. 14 1926.

c. KNOWLES T FOR CYLINDRICAL GRINDERS BAC'K RES 3 Sheets-Sheet 1."

Original iled Sept 17 1923 vN uh ATTORNLY Dec. 14 1926.

- c. KNOWLES BACK REST FOR C YLINDRICAL GRINDERS Qrigihal Filed Sept. 17, 1923 3 Sheets-Sheet 2 v INVENTOR @WCZM ATTORNEY mun 111mm Dec. 14 1926. 7

1 c. KNOWLES BACK REST FOR CYLINDRTCAL GRINDERS Original File Sepc- 17, 1923 3 Sheets-Sheet 3 INVENTOR g uweeww ATTORNEY letented Dec, 1926.

7 present application,

' CARROLL memes, on naitrnbRD, oonnno riouir', manometera iviii'rivnv 1 COMPANY; OF NEW YORK, I l".'

an oonr'onnrron on NEW JERSEY. I

zencx'nnsr non crtinnni'oanGnnvnnns,

Application filed september 17, 192$,Seria1 No.1 663,159. a nwea m 12-, 1926.

' This invention relates to an improved form of Work rest or support adapted to be. ap?

plied to a grinding machine for operating upon cylindrical work and adapted to be automatically actuated during the operation of the machine, 1 v i a A principal object or thepresent invention is to provide a rotatably mounted backrest adapted to engage and support cylindrical work substanti a-llyopposite to the position of the wheel while it is being vground, 1 Also,

it is an object to provide means resiliently forcing the'rotatable back rest against the work while the Work is being reduced in diameter. v a q Another object of the inventionis to-adapt the backrest for use in aiiautomaticgrinding machine in which the abrasive Wheel is automatically advanced to a predetermined final 'positionand then automatically. returned to its initial position Another; object i to provide adjustable means controlling [the movements of the backrest so that the. support maybe trued to advance to its, Worksupportingfposition after thewheel has contacted With and trued np'the Work; i g

the above objects. by oscil-s I accomplish lating a member by a cam operated slide controlling" the position of the wheel 'QOn this oscillating me her Whichis' in the form 7 is the rotatable backrest;

of a frame i Another feature of the invention is thatjI provide a pivoted le'veripreferably Within the baseott the machine, one end ofwhich bears against a lever for actuating the back/ rest, the other end path of movement of the supplemental means on the wheel actuating slide.

of the lever being in the Another ob ect of theiiivention is toprovide simpleconnectingmeans betvven the ac"- tuating slide for'the Wheel andrthe osc llating frame of the'back rest softhatmovements] of the actuating slide will control the movements of vthe back rest in'prop'er timed relation; to the. movements of-t the Wheel; Prefthei rame' for the back after the grinding operation has beencompleted: \Nhile to its initial or and back rest.

v The present construction is; of the some general type as the machine sho-Wn in my c0.-

pending application Serial No.3580,268;-filed objects ofthe V August 7, 1922. Particularly,

present inveiiti'oncomprise 'implrovements"in the form of backrest and .lalso imprroved means for actuating itn connection Wlth a full- Yautomatic cylindrical grinding machine.

Y'Vith these andother objects in View, my invention consists in a the 1 features Sofa construction ancl'operation'set forthin the fol,- lowing specification and illustrated in the accompanying drawings; I"

In the accompanying {drawings annexed hereto and formingfapart'ot this specification, I have shown my invention embodied in a full automatic cylindrical griridingniachine for valve stems, but itfwi-lljbe 'understood that theinvention can be othe'rwiserem bodied and'that the drawings: are not t'oibe construedi as defining or" limiting .the scope oi the invention, the claim'sgap'pendedto3this specification being relied upon for that purpose. r r

@111 the drawingsiav 5 r 11; 5;. is x- Figure 1 is' aside elevation, of a por ion-of a cylindrical grinding'macliine shovvin-ggtlieimprov'ed'iiornii of back rest in its operative position. 1 1 mi Fig 2 is a rear elevation ,oztthe same showing the actuating means i Fig. 3isa frontelevia'tion'ofthe Work rotating 'andsupporting iinechanism shown upon smaller scale than in Eligsrhl :and 2.; the backlrestbeing-also, shown associated therewitli,-and

Fig. at is a fragmentary section fen "line 4;0f Fig. 1 showing athe mechanism for actuating the; back rest in operative relation 7 to theavheel and ivorki In" the above mentioned fdra-Win'gs, I have shown but one embodiment of the invent on which is no-wdeenied i-pite'fe'rable; bhtitjzisrto be understood that changes and :fmofdificati'ons; may :be, i'iiadetvvith-in the scope of the appendedclairiis-witliout departing from the spirit of tlieiin ven'tidn. I

Briefiy, my invention,initsybroadest asa' .pect, comprises; i the'iifollowing principal parts: firshyahase having a headstock and for :the Wheel slide movable longitudinally of the machine and having a cam surface for moving the wheel and its slide directly toward or from the work; fourth, a'rota'tably mounted back rest resiliently forced toward position to engage the Work during operation; fifth, a lever'adapted to contact with the wheel slide actuating member and adapted to'oscillate naled in an adjustable carrier16, the posibe varled relatlve to the frame 14 by means 1 advance the oscillating the tension on an actuating spring 23 a frame carrying the back rest out of engagement with the work when the wheel and wheel slide are in retracted position.

Referring more in detail to the figures of the drawings, I provide a support 10, this support being-adapted to be adjustably cured to the work supporting table 11 by means of bolts 12 or other suitable fastening. means. Mounted to oscillate upon the support about the axis of a shaft 13 is a frame 14 carrying a rotatably mounted back rest'15. As the support and oscillating frame '14 are generally similar to and operate in the same manner as those described in my-Icopending application Serial No. 580,268, it will be unnecessary to repeat the detailed description thereof; On the forward portion of the oscillating frame or member14 is the rotatable back rest 15jourtion of which may of suitable screws17. Also mounted on the support '10 is an adjustable stop 18 adapted to contact with a bearing surface19 provided on the oscillating'frame 14. 'By adjustment of this stop 18, the frame 14 with its back rest 15 may be 'advancedto any predetermined precise position relative to the wor: l Also, to frame 14 toward the work and to constantly urge it toward its final operative position, a spring pressed plunger 20 is mounted in the support 10, one end of the plunger 20 beingadapted to bear against a plate 21 provided ing frame 14. By adjustment of a screjy 22,

ear-

ingagainst the plunger 20' may be varied to increase or decrease the pressure urging the work rest 7 15 into contact against the work W.

As shown most clearly in Fig. 1, the oscil lating frame 14 supports the rotatable back rest 15 in a position directly opposite to the position of the wheel 25. In this position of the back rest 15, the pressure of the abraway tofthe corresponding sive wheel 25 against the work Wis directly taken by the-back rest.

Also, as shown in Fig. 1, the wheel 25 is mounted rotatably in a slide 26 movable topartsshown in my on the oscillatapplication Serial No. 587,158, filed September 9, 1922. For thatreason, a detailed de-' scription will be unnecessary. A drum 2'? having cam strips 28 thereon is en aged by a roller 29 on an actuating slide 30 and serves to reciprocate the actuating slide "as the drum rotates. A roller 31 on the wheel slide 26 engages a cam slot (not shown) in the actuating slide 30 so that as the actuat i eits slide 26 are advanced and retracted.

In order to retract the work rest 15 from its operative position simultaneously with movements o-f'the wheel 25 away from the work W, the following mechanism is proslide 30 is reciprocated, the wheel 25 and vided: At one end of the shaft 13 about which the frame 14 carrying the wort rest oscillates 1s a short lever 35. This isfastoned to the shaft 13 so that movementof the lever 35 will serve to vary the position of 1 actuating the work rest 15 toward or from the work Attached directly to the wheel slide one end and extending directly therefrom. On this shaft or rod 36 is a cam plate 37 as shown most clearly in Fig. 2. Movement of the plate 37 with movements of this rod 36 and slide 30 brings a cam surface 38 on the plate 37 into contact with a roller 39 on a lever 40 adapted to oscillate about a shaft 41 mounted within the machine base. In order to time the support 15 to move into work supporting position, the cam plate 37 on the rod 36 is adjustably secured thereto by clamping bolts 42 so that the position of the cam 37 may be varied. By these means, the support 15 when adjusted will be held from contacting with and supporting the work until the wheel has engaged and trued the I work. As soon as this takes place, the support 15 may be allowed .toadvance under the influence of spring 23.

Also the opposite end of the contacts with a surface on the'lever 35 to actuate the oscillating frame 14 is provided.

with an adjustable end 44 preferably thread-- ed thereto so that the length of this lever may beslightlyvarled. I By adjustment of these members including the cam plate'37 and lcver 40, the point in the cycle of operations at;

which the work rest 15 is retracted from the work W also may be slightly varied.

In operation, the work W is mounted upon suitable rotating and supporting means provided on a headstock and tailstock51. These, as shown, aremounted on the work table 11. I sitioned for operation on Work of varying diameters by adjustment of a screw 52 preferably by means of a hand wheel 53. 'With the parts properly adjusted the back rest 15 may be accurately adjusted by positioning the stop 18. V 1

The work W may be positioned onits supportingand rotating means by any suitable 30 is a rod 36 fastened preferably at' lever40 which 7 The wheel 25 on its slide 26 is po-f I plate 37 and thus again permitsthe rest 15 means either automaticallyor manually and the wheel advanced directly toward the work Vi? by the cam controlled means .above' 7 described. Simultaneously with the advanc- 7 ing movement of the wheel, the work rest will be permitted to advance and support the work while it is being reduced in diameter. operation, the roller 39 isaway from the cam plate 37 so that spring 23forces the oscillating frame 14 work W.

As soon as the operation on onework blank is completed and the wheel v25 isre-w tracted to its initial position away from the work,'the slide moves to then'right as seen:

in Fig. 2 and the roller 39 contacts with the cam surface 38 ofca-m plate 37. This depresses roll-er 39, oscillates lever 40,fiand forces the lever end 44 against lever thus retracting the rest 15 from the work W. As long as the slide'30 is in this position sothat the roller 39 rests on thecam plate-'37, the.

rest 15 will be held in its retracted position.

With the next advancing movement of the wheel slide 26 andcorresponding movement of the slide 3Q, roller 39 passes off" the cam prising in combination, a base, work supporting and rotating means thereon, awheel movable toward and from the work, a rotatablymounted back rest adapted to contact with and support the work in operative position during the, grinding operation, and means to withdraw the back rest from its operative position when said wheel is moved fromthe work. I 1

2. A cylindrical grinding macliine comprising incombination, a base, work supporting and rotating means thereon, 'awheel movable toward and from the work, ajrotatably mounted back rest adapted to contact with and support the workin operative posi" tion during the grinding operation, and cam actuated means to, oscillate the back rest from its operative position is moved fromthe work. V V I a 3. A cylindrical grlnding mach ne comwlien said wheel prising in combination, a base, work supporting and-rotating means thereon, awheel movable toward and from the work, a rotaltably mounted back restjpositioned directly oppositethe wheel and adapted to contact 7 with and support the work in operative position during the grinding operation, and

means to withdraw theback rest from its During this period of. the machines' ancLthe rest 15 toward the.

operative po'sition when said wh-eelis moved from thework.

.- 4. A cylindrical grinding machine comprising incombination, a base, worksupporting and rotating means thereon, awheel movable toward and 'from the work, a cam actuated slide for controlling theposition of said wheel, a rotatably mounted back.

rest adapted to contact with and support the work 1n its operative pOSliDlOII during the grinding operat on, and means asso- -"ciated with said cam .actn atedslide to withdraw the'back rest. from itsoperative'position when said wheel is moved away from the work.

5. A' cylindrical grinding machine com prising 1n. combination, a base, work supf porting and rotating-means thereon, a wheel movable toward and from the work, a cam actuated slide for controlling the position of said wheel,a rotatably mounted back rest adapted to contact iwithv and support the work in its operative position during the grinding operation, anda' lever actuated by said cam actuatedshde-to wi lidraw the back rest from its operative position "when said wheel s moved away from the work.

prising in combination, a base, work supporting and rotating means thereon, a wheel movable toward and from theworl'z, a cam actuated slide for controlling theposition of said wheel, 'a rotatably mounted back rest adapted to contact with and supportthe work in ts operative position during the grinding operation, and a supplementary cam associated with said cam actuated slide and adapted to withdraw the back rest from its operative position when said wheel is moved away'from thework.

' 7. A cylindrical grinding machine-comprising in combination, a base, work supporting and rotating means thereon, a wheel movable toward and from "the work, a rotatably mounted back rest adapted to con- 6. A cylindrical. grinding machine com I tact with and support work in its operative I position during the grinding operation, an oscillatlng frame carrymg-said back rest,

and means/to oscillate the frame to retract, the back rest from operative position when said wheel is moved away from the work.

8. A cylindrical grinding machine com prising in combination, a'base, work supportlng and rotating means thereon, a wheel movable toward and from the work, cam 3i actuatedmeans to move said wheel toward and from the work, a 'rotatably mounted back rest adapted to contactwith and support work in its operatlve position'wdurlng the grinding operation, an oscillating frame 1 carrying said back rest, and meansoperated by said camactuatedmeans to oscillate the frame to retract the back rest from operative position when said wheel is moved away 'lIlU.

from the work.

9. A cylindrical grinding machine comprising in combination, a base, work supporting and rotating means thereon, wheel movable toward and from the work, a rotatably mounted back rest adapted to contact with and Support work in its operative position during the grinding operation, an oscillating frame carrying said back rest, means to oscillate said "frame to retract the back rest from operative position when said wheel is moved away from the work, and resilient means normally ward its operative position. e

10. A cylindrical grinding machine comprising in combination, a base, work supporting and rotating means thereon, a wheel movable toward and from the work, a slide forrcontrolling the position of said wheel, a

rotatably mounted backrest adapted to contact with and support work in its operative position during the grinding operation, an oscillating frame carryingthe said back rest, and means associated with said slide to oscil late the frame and retract the back restfrom operative position when said wheel is moved away from the work. 1

11. A cylindrical grinding machine cornprising in combination, a base, work sup- 7 and a supplemental cam carried by said slide forcing said back rest tofor controlling the position of said wheel,

a rotatably mounted backrest adapted to contactwith and support work in its opera tive position during the grinding operation, an oscillating frame carrying the said back rest, and a supplemental cam adjustable relative to said slide to oscillate the frame and to retract the back rest from operative position when said wheel is moved from the work.

13. A cylindrical grinding machine comprising in combination, a base, work supporting and rotating means thereon, a wheel movable toward and from the work,-a' slide for controlling the positionof said wheel, a

rotatably mounted back rest adapted to contact with and support work in its operative position during the grinding operation, an oscillating frame carrying the said back rest,

alsupplemental cam adjustable relative to said slide to oscillate the frame and to retract the back rest from operative position when said wheel is moved away from the work, and resilient meansnormally forcing said back rest toward its operative position.

In testimony whereof, I hereto my signature.

CARROLL KNOWLES; 

